EVT_UFX_DEVICE_USB_STATE_CHANGE回调函数 (ufxclient.h)

用于更新 USB 设备状态的客户端驱动程序实现。

语法

EVT_UFX_DEVICE_USB_STATE_CHANGE EvtUfxDeviceUsbStateChange;

void EvtUfxDeviceUsbStateChange(
  [in] UFXDEVICE unnamedParam1,
  [in] USBFN_DEVICE_STATE unnamedParam2
)
{...}

参数

[in] unnamedParam1

客户端驱动程序在对 UfxDeviceCreate 的上一次调用中收到的 USB 设备对象的句柄。

[in] unnamedParam2

指示 USB 设备状态的USBFN_DEVICE_STATE类型标志。

返回值

备注

函数主机控制器的客户端驱动程序通过调用 UfxDeviceCreate 方法,使用 USB 函数类扩展 (UFX) 注册其EVT_UFX_DEVICE_USB_STATE_CHANGE实现。

UFX 调用此事件回调,以通知客户端驱动程序设备的新状态。

客户端驱动程序通过调用 UfxDeviceEventComplete 方法指示完成此事件。

示例


EVT_UFX_DEVICE_USB_STATE_CHANGE UfxDevice_EvtDeviceUsbStateChange;

VOID
UfxDevice_EvtDeviceUsbStateChange (
    _In_ UFXDEVICE UfxDevice,
    _In_ USBFN_DEVICE_STATE NewState
)
/*++

Routine Description:

    EvtDeviceUsbStateChange handler for the UFXDEVICE object.

Arguments:

    UfxDevice - UFXDEVICE object representing the device.

    NewState - The new device state.

--*/
{
    NTSTATUS Status;
    PUFXDEVICE_CONTEXT Context;
    PCONTROLLER_CONTEXT ControllerContext;
    ULONG EpIndex;
    USBFN_DEVICE_STATE OldState;
 
    PAGED_CODE();

    TraceEntry();

    Context = UfxDeviceGetContext(UfxDevice);
    ControllerContext = DeviceGetControllerContext(Context->FdoWdfDevice);
    OldState = Context->UsbState;

    TraceInformation("New STATE: %d", NewState);

    Status = UfxDeviceStopOrResumeIdle(UfxDevice, NewState, Context->UsbPort);
    LOG_NT_MSG(Status, "Failed to stop or resume idle");

    WdfWaitLockAcquire(ControllerContext->InitializeDefaultEndpointLock, NULL);
    if (ControllerContext->InitializeDefaultEndpoint == TRUE) {
        //
        // Reset endpoint 0. This is the last part of soft reset, which was postponed
        // until now, since we need to make sure EP0 is created by UFX.
        //
        DeviceInitializeDefaultEndpoint(Context->FdoWdfDevice);
        ControllerContext->InitializeDefaultEndpoint = FALSE;
    }
    WdfWaitLockRelease(ControllerContext->InitializeDefaultEndpointLock);

    if (NewState == UsbfnDeviceStateConfigured && OldState != UsbfnDeviceStateSuspended) {

        for (EpIndex = 1; EpIndex < WdfCollectionGetCount(Context->Endpoints); EpIndex++) {
            UfxEndpointConfigure(WdfCollectionGetItem(Context->Endpoints, EpIndex));
        }

        // 
        // #### TODO: Insert code to allow the controller to accept U1/U2, if supported ####
        //
       
    }


    if (NewState == UsbfnDeviceStateDetached) {
        KeSetEvent(&ControllerContext->DetachEvent,
                   IO_NO_INCREMENT,
                   FALSE);
    }

    UfxDeviceEventComplete(UfxDevice, STATUS_SUCCESS);
    TraceExit();
}

要求

   
目标平台 Windows
最低 KMDF 版本 1.0
最低 UMDF 版本 2.0
Header ufxclient.h
IRQL PASSIVE_LEVEL

另请参阅

UfxDeviceCreate

UfxDeviceEventComplete